Doppler Effect Calculator

Emitted Frequency:
Medium Velocity:
Receiver Ralative Velocity:
Source Relative Velocity:
Received Frequency:


Doppler effect also known as Doppler shift, is the change in frequency of a wave for an observer moving relative to the source of the wave. E.g. the siren of a fast approaching train you heard usually much higher than a fast departing train.

The Doppler effect equation is:
  f = f0 * (v + vr)/ (v + vs)

Where:

  v: the velocity of waves in the medium
  vr: The velocity of the receiver relative to the medium, positive if the receiver is moving towards the source
  vs: The velocity of the source relative to the medium, positive if the source is moving away from the receiver
  fs: Emitted Frequency
  f: Received Frequency

The most widely used Doppler effect application is radar, e.g. police radar and radar for air traffic control.

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